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A B737-700; flying slightly above their 'optimum' altitude; encountered turbulence that consecutively oversped and then slowed the aircraft to and below stick shaker airspeed necessitating a descent to a lower altitude to recover. The slow acceleration of the engines from idle contributed to the prolonged recovery.
| Attributes | |
| ACN | 955393 |
| Time | |
| Date | 201106 |
| Local Time Of Day | 0601-1200 |
| Place | |
| Locale Reference | ZME.ARTCC |
| State Reference | TN |
| Aircraft 1 | |
| Make Model Name | B737-700 |
| Operating Under FAR Part | Part 121 |
| Flight Phase | Cruise |
| Flight Plan | IFR |
| Person 1 | |
| Function | Captain |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Person 2 | |
| Function | Pilot Not Flying First Officer |
| Qualification | Flight Crew Air Transport Pilot (ATP) |
| Events | |
| Anomaly | Aircraft Equipment Problem Less Severe Deviation - Altitude Excursion From Assigned Altitude Deviation - Procedural Clearance Deviation - Speed All Types Inflight Event / Encounter Loss Of Aircraft Control Inflight Event / Encounter Weather / Turbulence |
Narrative:
Flying at FL410 we entered moderate turbulence which caused the airplane to overspeed. I reduced the power and it was not slowing down so I reduced the power to idle. As soon as we got out of the overspeed we encountered more turbulence and the stick shaker activated and disengaged the ap. I increased to full power and pushed nose down. Were about 500 feet below 410 when we requested and received clearance for 390. The engines would not spool up; it took a good 45 seconds. Approaching 390 we decided to request 370 because it the engines were still not spooled up. We were given 370 and a 15 degree turn for traffic.
Original NASA ASRS Text
Title: A B737-700; flying slightly above their 'optimum' altitude; encountered turbulence that consecutively oversped and then slowed the aircraft to and below stick shaker airspeed necessitating a descent to a lower altitude to recover. The slow acceleration of the engines from idle contributed to the prolonged recovery.
Narrative: Flying at FL410 we entered moderate turbulence which caused the airplane to overspeed. I reduced the power and it was not slowing down so I reduced the power to idle. As soon as we got out of the overspeed we encountered more turbulence and the stick shaker activated and disengaged the AP. I increased to full power and pushed nose down. Were about 500 feet below 410 when we requested and received clearance for 390. The engines would not spool up; it took a good 45 seconds. Approaching 390 we decided to request 370 because it the engines were still not spooled up. We were given 370 and a 15 degree turn for traffic.
Data retrieved from NASA's ASRS site as of April 2012 and automatically converted to unabbreviated mixed upper/lowercase text. This report is for informational purposes with no guarantee of accuracy. See NASA's ASRS site for official report.